58
925.916.2 - GB
InstructIons pertaInInG to the InstaLLer
16. gas Change moDalItIes
Carry out the following operations in the given sequence:
1) calibration of the maximum heat output.
Check that the CO
2
measured on the flue, with the boiler operating at the
maximum heat output, is the same as that shown in table 1. Otherwise, turn the regulation screw (V) on the gas val-
ve;
2) calibration of the reduced heat output.
Check that the CO
2
measured on the flue, with the boiler operating at the
minimum heat output, is the same as that shown in table 1. Otherwise, turn the regulation screw (K) on the gas valve.
Turn the screw clockwise to increase the concentration of CO
2
and anticlockwise to reduce it.
0310_0114
Figure 14
pi:
Gas supply pressure connection point
po/pout:
Gas pressure to burner connection point
p:
Pressure connection point for measurement of the OFFSET
pl:
Air signal input from fan
V:
Gas flow adjuster screw
K:
OFFSET adjuster screw
Gas VaLVe sIt
MoDeL sIGMa
848
